The Kindle HD10 tablet should work with Roon, can you please let me know what router you are using here? How is the Kindle connected to the network, is it connecting directly to the router or are you making use of any range extenders?
One other test that I would like to ask you to perform is trying a different Core to host Roon. If you temporarily use a Windows or OSX machine to host the Roon core, is the Kindle HD 10 visible then? Please let me know your findings when possible.
Thanks for confirming that the Kindle works as expected when using Windows.
We have seen a similar issue pop up before in this thread (Android app having trouble finding Linux Core) but unfortunately we have not been able to reproduce this in-house with any of our staff member’s setups or in a QA environment, even though we have collected quite a lot of information from affected customers and spent a considerable amount of time trying to reproduce in-house.
One way to verify if this is the same issue that you are experiencing is to perform this test:
• Open your Kindle Roon App and leave it open, having the QNAP as the Core
• Restart your QNAP
• See if you are able to connect after restarting
If you are able to reproduce this issue with those steps, some users have reported that they have been able to resolve this issue by turning off IGMP snooping on their Router.
I have found the manual for your router here and it does indeed appear to have the IGMP snooping option (page 139), although you will need to make this setting as a CONFIG command to the router (AT&T may be able to assist here with making that setting).
Please let me know if disabling IGMP Proxying improves the communication between your Android devices and helps resolve the issue with the Android devices connecting.
I’ve been through this on my Fire and participated in the thread noris linked to. You can reboot the Fire and it will usually find the Core. I run my Core on Linux and found I could bounce the Core service and the Fire would immediately find it. I gave up…I got tired of other issues on the cheap Fire, gave the thing to my son and went back to an iPad and I’m much happier.
What I gathered from the thread was that the issue resurfaces once the Android device enters sleep mode and the only way to re-establish connectivity would be to restart the Core as you did.
The IGMP snooping setting has had good results for several users on that thread so I would give that a go and see if it allows stable communication from your QNAP to Kindle. Please keep me posted on your findings.
Did you try Googling your model number and how to disable IGMP snooping? I can tell you that I bought a Netgear 24 port smart switch last year and immediately started having issues with connection problems with my TiVo system. I asked for help on a TiVo forum and discovered it was IGMP snooping that was causing the problem. I Googled how to disable it and that fixed all my issues. I bet there is a solution online somewhere.
I Googled your Arris router and there is an extensive section on IGMP snooping in the manual which you should be able to find. There are configuration parameters in the manual that you could try. Specifically on page 139.